Wiktionary
n. 1 (context obsolete English) All known inhabited areas of the world. 2 (context religion English) Unification of Christianity.
Wikipedia
The ecumene ( US) or oecumene ( UK; , oikouménē, "inhabited") was an ancient Greek term for the known world, the inhabited world, or the habitable world. Under the Roman Empire, it came to refer to civilization and the secular and religious imperial administration. In present usage, it is used as the noun form of " ecumenical" and describes the Christian Church as a unified whole or the unified modern world civilization. It is also used in cartography to describe a type of world map ( mappa mundi) used in late Antiquity and the Middle Ages.
Usage examples of "ecumene".
The concept of the state, moreover, is yielding rapidly at this hour to the concept of the ecumene, i.